Kaltura_Client_Exception thrown

Invalid KS "OThmNThmMWE5ZTc3ZDllYzZkMGRlMTZjZDcwMzQ4NTIzMGY3MjU2YXwxMDE7OzE0NzUwMTY3MTE7MjsxNDc0OTMwMzExLjI4NjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"